Weapons Evolve Faster Than Sperm in Bovids and Cervids

In polyandrous species, males face reproductive competition both before and after mating. Sexual selection thus shapes the evolution of both pre- and postcopulatory traits, creating competing demands on resource allocation to different reproductive episodes. Traits subject to strong selection exhibit accelerated rates of phenotypic divergence, and examining evolutionary rates may inform us about the relative importance and potential fitness consequences of investing in traits under either pre- or postcopulatory sexual selection. Here, we used a comparative approach to assess evolutionary rates of key competitive traits in two artiodactyl families, bovids (family Bovidae) and cervids (family Cervidae), where male–male competition can occur before and after mating. We quantified and compared evolutionary rates of male weaponry (horns and antlers), body size/mass, testes mass, and sperm morphometrics. We found that weapons evolve faster than sperm dimensions. In contrast, testes and body mass evolve at similar rates. These results suggest strong, but differential, selection on both pre- and postcopulatory traits in bovids and cervids. Furthermore, we documented distinct evolutionary rates among different sperm components, with sperm head and midpiece evolving faster than the flagellum. Finally, we demonstrate that, despite considerable differences in weapon development between bovids and cervids, the overall evolutionary patterns between these families were broadly consistent.

Indonesia-North Korea Diplomatic Relations: Effort to Pursue National Interest and Create Regional Peace [Hubungan Diplomatik Indonesia – Korea Utara: Upaya Mewujudkan Kepentingan Nasional dan Menciptakan Perdamaian Regional]

This article aims to analyze the implementation of Indonesia’s foreign policy towards North Korea over its approximately fifty-nine years of bilateral relations, since 17 June 1961. The arguments posited in this regard is that the implementation of Indonesia’s foreign policy towards North Korea has been counterproductive. Under the leadership of President Joko Widodo, Indonesia actually has great potential to influence North Korea’s conducts through the close diplomatic relations that the two countries have developed. The friendship between Indonesia and North Korea began since the two states conducted reciprocal official visits 1964 and 1965. Indonesia’s foreign policy towards South Korea has often been carried out to influence the offensive decisions of North Korean leaders, especially in relation to the issue of nuclear weapon development. The key question is what should and can Indonesia do next to help create peace and stability in the Korean Peninsula by adhering to the principles of a free and active foreign policy? Why is it necessary for Indonesia to do this and how can Indonesia carry out this foreign policy towards North Korea? After becoming President since 2011, Kim Jong-un had to weaken his father’s winning coalition to consolidate domestic political stability. However, North Korea’s domestic market reforms have had the effect of eroding the Kim family’s ideological appeal. This is relevant to the expansion of political influence from Pyongyang, which prioritizes the continuation of a fragile centralized authoritarian power while maintaining sustainable domestic economic growth.AbstrakArtikel ini bertujuan menjelaskan secara analitis bagaimana implementasi kebijakan luar negeri Indonesia terhadap Korea Utara selama 59 tahun sejak 17 Juni 1961. Argumen yang ingin disampaikan tentang implementasi kebijakan luar negeri Indonesia terhadap Korea Utara adalah kontraproduktif. Indonesia di bawah kepemimpinan Presiden Joko Widodo berpotensi besar untuk mampu memengaruhi perilaku Korea Utara melalui hubungan diplomatik. Persahabatan Indonesia dan Korea Utara dimulai sejak saling kunjung di 1964 dan 1965. Orientasi politik luar negeri Indonesia di masa lalu hingga saat ini, telah sering dilakukan untuk memengaruhi keputusan ofensif para pemimpin Korea Utara, khususnya terkait dengan isu pengembangan senjata nuklir. Pertanyaannya adalah apa yang harus dan sebaiknya dilakukan Indonesia selanjutnya untuk membantu menciptakan perdamaian dan stabilitas di Semenanjung Korea dengan tetap berpegang pada prinsip politik luar negeri bebas dan aktif? Mengapa hal tersebut perlu dilakukan oleh Indonesia dan bagaimana cara menjalankan kebijakan luar negeri terhadap Korea Utara tersebut? Kim Jong-un, setelah menjadi Presiden sejak 2011, harus melemahkan posisi koalisi pemenang ayahnya untuk konsolidasi stabilitas politik dalam negeri. Bagaimanapun, reformasi pasar domestik Korea Utara telah berdampak pada pengikisan daya tarik ideologis keluarga Kim. Hal ini relevan dengan perluasan pengaruh politik dari Pyongyang memprioritaskan pada keberlangsungan kekuatan otoriter terpusat yang rentan seiring bagaimana dapat mempertahankan pertumbuhan ekonomi dalam negeri berkelanjutan.

Nutrition and ontogeny influence weapon development in a long-lived mammal

Selection in male cervids should optimize allocation of nutritional resources to the competing demands of body growth versus weapon development. We investigated allocation decisions of growing and mature male white-tailed deer (Odocoileus virginianus (Zimmerman, 1780)) from three regions of low, moderate, and high diet quality. We tested (i) if deer under greater nutritional limitations would allocate proportionally less to antler growth, (ii) if antler and body mass became less variable with age, and (iii) if antler size consistently exhibited positive allometry with body mass across age classes and nutritional planes. Greater nutrition increased antler allocation in 2.5 to 4.5 year olds but not in yearlings or prime-aged males. Variability of antler mass decreased with age and was generally less in more fertile regions, but body mass was equally variable across all ages and regions. Antler mass was positively allometric with body mass for all combinations of age class and region but exhibited age- and region-related differences. Our results suggest that accruing body mass is more important to lifetime reproductive success than increasing weapon size. Reduced allometric coefficients in older males likely stem from increasing use of skeletal mineral reserves, selective pressures favoring greater body mass, and possible selection for optimal weapon strength and structure.